You are studying for your final exam on the semester. up to this point, you received 3 exam scores of 99%, 80%, and 70%. to receive a grade of b in the class, you must have an average exam score between 80% and 89% for all 4 exams including the final. find the widest range of scores that you can get on the final exam in order to receive a grade of b for the class. use interval notation

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have